<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root"></div>
    <script src="../vue3基础源码/vue3.js"></script>
    <script>
        const app = Vue.createApp({

            template:`<test />`,
            setup(){
                const {ref,provide,readonly} = Vue;
                const name = ref("dong");
                provide("name",readonly(name));

                const Fn = val => {
                    name.value = val;
                }
                provide("appFn",Fn);
            }

        });

        app.component("test",{
            template:`<div @click="handleClick">{{name}}</div>`,
            setup(){
                const {inject} = Vue;

                const name = inject("name");
                const appFn = inject("appFn");

                const handleClick = () => {
                    appFn("zhangxudong");
                    // name.value = "zhangxudong";
                }
                return {name,handleClick};
            }
        })


        const vm = app.mount("#root");
    </script>
</body>
</html>